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KVM: Trace failed msr reads and writes
Record failed msrs reads and writes, and the fact that they failed as well. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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parent
6e7d152967
commit
59200273c4
3 changed files with 22 additions and 13 deletions
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@ -2177,9 +2177,10 @@ static int rdmsr_interception(struct vcpu_svm *svm)
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u32 ecx = svm->vcpu.arch.regs[VCPU_REGS_RCX];
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u64 data;
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if (svm_get_msr(&svm->vcpu, ecx, &data))
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if (svm_get_msr(&svm->vcpu, ecx, &data)) {
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trace_kvm_msr_read_ex(ecx);
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kvm_inject_gp(&svm->vcpu, 0);
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else {
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} else {
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trace_kvm_msr_read(ecx, data);
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svm->vcpu.arch.regs[VCPU_REGS_RAX] = data & 0xffffffff;
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@ -2271,13 +2272,15 @@ static int wrmsr_interception(struct vcpu_svm *svm)
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u64 data = (svm->vcpu.arch.regs[VCPU_REGS_RAX] & -1u)
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| ((u64)(svm->vcpu.arch.regs[VCPU_REGS_RDX] & -1u) << 32);
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trace_kvm_msr_write(ecx, data);
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svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
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if (svm_set_msr(&svm->vcpu, ecx, data))
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if (svm_set_msr(&svm->vcpu, ecx, data)) {
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trace_kvm_msr_write_ex(ecx, data);
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kvm_inject_gp(&svm->vcpu, 0);
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else
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} else {
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trace_kvm_msr_write(ecx, data);
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skip_emulated_instruction(&svm->vcpu);
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}
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return 1;
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}
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@ -246,28 +246,33 @@ TRACE_EVENT(kvm_page_fault,
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* Tracepoint for guest MSR access.
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*/
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TRACE_EVENT(kvm_msr,
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TP_PROTO(unsigned write, u32 ecx, u64 data),
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TP_ARGS(write, ecx, data),
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TP_PROTO(unsigned write, u32 ecx, u64 data, bool exception),
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TP_ARGS(write, ecx, data, exception),
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TP_STRUCT__entry(
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__field( unsigned, write )
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__field( u32, ecx )
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__field( u64, data )
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__field( u8, exception )
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),
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TP_fast_assign(
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__entry->write = write;
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__entry->ecx = ecx;
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__entry->data = data;
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__entry->exception = exception;
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),
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TP_printk("msr_%s %x = 0x%llx",
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TP_printk("msr_%s %x = 0x%llx%s",
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__entry->write ? "write" : "read",
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__entry->ecx, __entry->data)
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__entry->ecx, __entry->data,
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__entry->exception ? " (#GP)" : "")
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);
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#define trace_kvm_msr_read(ecx, data) trace_kvm_msr(0, ecx, data)
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#define trace_kvm_msr_write(ecx, data) trace_kvm_msr(1, ecx, data)
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#define trace_kvm_msr_read(ecx, data) trace_kvm_msr(0, ecx, data, false)
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#define trace_kvm_msr_write(ecx, data) trace_kvm_msr(1, ecx, data, false)
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#define trace_kvm_msr_read_ex(ecx) trace_kvm_msr(0, ecx, 0, true)
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#define trace_kvm_msr_write_ex(ecx, data) trace_kvm_msr(1, ecx, data, true)
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/*
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* Tracepoint for guest CR access.
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@ -3158,6 +3158,7 @@ static int handle_rdmsr(struct kvm_vcpu *vcpu)
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u64 data;
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if (vmx_get_msr(vcpu, ecx, &data)) {
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trace_kvm_msr_read_ex(ecx);
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kvm_inject_gp(vcpu, 0);
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return 1;
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}
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@ -3177,13 +3178,13 @@ static int handle_wrmsr(struct kvm_vcpu *vcpu)
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u64 data = (vcpu->arch.regs[VCPU_REGS_RAX] & -1u)
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| ((u64)(vcpu->arch.regs[VCPU_REGS_RDX] & -1u) << 32);
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trace_kvm_msr_write(ecx, data);
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if (vmx_set_msr(vcpu, ecx, data) != 0) {
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trace_kvm_msr_write_ex(ecx, data);
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kvm_inject_gp(vcpu, 0);
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return 1;
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}
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trace_kvm_msr_write(ecx, data);
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skip_emulated_instruction(vcpu);
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return 1;
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}
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